EP0512448A1 - Vorrichtung zum Lesen von blassen Farbmarken in Druckmaschinen - Google Patents

Vorrichtung zum Lesen von blassen Farbmarken in Druckmaschinen Download PDF

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Publication number
EP0512448A1
EP0512448A1 EP92107486A EP92107486A EP0512448A1 EP 0512448 A1 EP0512448 A1 EP 0512448A1 EP 92107486 A EP92107486 A EP 92107486A EP 92107486 A EP92107486 A EP 92107486A EP 0512448 A1 EP0512448 A1 EP 0512448A1
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EP
European Patent Office
Prior art keywords
stage
pulses
followed
voltage
mark
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92107486A
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English (en)
French (fr)
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EP0512448B1 (de
Inventor
Patrick Monney
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Bobst Mex SA
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Bobst SA
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Publication of EP0512448A1 publication Critical patent/EP0512448A1/de
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Publication of EP0512448B1 publication Critical patent/EP0512448B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices

Definitions

  • the present invention relates, in a polychrome printing machine, to a device for reading marks of different colors printed by each printing station, these marks subsequently making it possible to determine the identification error of each color by relative to the color of the first station taken as a reference.
  • Known devices such as that described in document EP 0 094 027, function to satisfaction as long as the yellow, blue or red marks are sufficiently contrasted to be recognized without ambiguity by the device.
  • Some of these known devices may include a bundle of optical fibers carrying light on the printed element and conducting the reflected light to a reading photodiode which produces an electrical signal.
  • a filter usually blue, is interposed between the optical fibers and the photodiode. .
  • the object of the present invention is a device detecting a printed mark whatever its color, its intensity and its contrast with respect to the background color of the plate element on which it is printed.
  • a device for reading a printed mark because it comprises at least two parallel channels for reading marks, each generating an electrical pulse at the output when the mark passes in front of the light source, the photosensitive unit at the input of each channel being sensitive in a color band distinct from the others; as well as electronic means selecting, from the electrical pulses generated by the channels, the most representative pulse of the brand.
  • each read channel further comprises, before the converter stage, a rectifier stage imposing on all the electrical pulses a variation in the same direction with respect to the basic voltage.
  • the photosensitive unit includes a photodiode behind a colored filter and connected to the input of a current / voltage converter.
  • the rectifier stage comprises a first stage for measuring the base voltage, followed by a stage for subtracting the base voltage leaving only positive or negative electrical pulses, followed by a stage rectification for only positive pulses into negative pulses, followed by a summation stage of all the pulses and followed by a readjustment stage of the basic voltage.
  • the converter stage comprises a first peak detection stage followed by a second stage of subtraction from the input signal of the threshold detected by the first stage, the difference being applied to a tilting comparator as soon as the difference exceeds a predetermined threshold, as well as first electronic means resetting and reversing the direction of detection of the peak detection stage and second electronic means reversing the polarity of the comparison threshold applied to the comparator after a first switching of this comparator .
  • the electronic pulse selection means comprise a first "OR" gate receiving on each of its inputs one of the pulses and the output of which is connected to the clock input "CLK” d 'a first flip-flop, as well as as many secondary flip-flops as pulses to be analyzed, these pulses being received inversely on the clock input "CLK”, all the outputs reversed of the secondary flip-flops " Q ⁇ "being connected to the input of a second" AND “gate, the output of which is connected to the reset input” CL “of the first flip-flop, the reset input” CL “of each secondary flip-flop being connected to the output "Q" of the first flip-flop, a last control line of the electronic means being connected to one of the inputs of the second gate "AND".
  • the device further comprises an analog / digital and digital / analog converter connected to a microprocessor for receiving the measurement of the base voltage from the rectifier stage and for applying on the one hand to the stage amplification with automatic gain, when present, an electrical signal representative of the gain to be applied, and on the other hand at the converter stage an electrical signal representative of the optimum threshold for the comparator.
  • the voltage is permanently maintained at a value of approximately 8 volts and the detection threshold of the comparator is fixed at a value between 200 and 400 millivolts above the average noise present on the base voltage. .
  • the photodiodes 32,33 are respectively made sensitive to distinct colors by means of filters 30,31 interposed between the output of the optical fibers and the photodiodes.
  • the filter 30 can be a dark purple filter favoring the yellow marks, while the filter 31 is green promoting the blue marks.
  • the electrical signals from each photodiode are first conditioned separately and in parallel by identical processing channels and constituted by the circuits 34, 40, 50 and 60 before being compared for selection by a circuit 70.
  • These identical and parallel conditioning channels each each firstly comprise a current / voltage converter 34 transforming the variation in intensity within the photodiode caused by the passage of the mark 15 in front of the optical fiber into a variation in voltage.
  • this current / voltage converter is made so known by means of an operational amplifier and a negative feedback between its negative output and input. Jumpers symbolized at the output allow to implement a first or a second feedback circuit modifying in a ratio of 1 to 10 the gain of the amplification of this stage.
  • This voltage signal is then amplified by an automatic gain amplifier circuit 40 so that the basic signal corresponding to an unprinted area of the element 10 is fixed at a value of the order of 8 volts.
  • the base voltage collected at the output of the current / voltage converter 34 can vary between 150 millivolts and 8 volts.
  • the electrical signal then passes through a rectifier circuit which has the function of bringing all the pulses caused by a color mark in the same direction, in this case negative, with respect to the basic voltage.
  • the marks 15 are printed with colors darker than the background color and thus cause a reduction in the light reflected in the optical fibers, ie an instantaneous reduction in the current passing through the photodiode 30 therefore a pulse of value lower than the basic voltage value.
  • the marks appear lighter than the background color, or even are printed with particularly reflective colors such as gold or silver, the reflected light is momentarily greater than the base light and it in the same is true for the corresponding electrical pulse.
  • This rectifier circuit makes it possible, by bringing all the pulses to the same side, to greatly simplify the subsequent selection circuit.
  • Figure la shows a device similar to that of Figure 1 in which the optical fiber 25 has not been split.
  • a light diffusion member 25a has been arranged at the end of the optical fiber 25 so that the reflected light is routed indifferently on the filters 30 and 31.
  • the construction of the other elements of the device comprising inter alia the photodiodes 32 and 33 as well as the current / voltage converters 34 and 35 remains unchanged compared to the arrangement described in FIG. 1.
  • this rectifier circuit 50 first comprises a bottom measurement stage 51 followed by a bottom subtraction stage 53 followed by the effective rectification stage 55 followed by a stage for adding the pulses 57 which finally ends a floor of readjustment of the bottom 59.
  • the bottom measurement stage 51 essentially comprises the combination of a diode 513 and a capacitor 514, the other branch of which is connected to ground.
  • Operational amplifiers 511 and 512 provide stage isolation.
  • the switch 515 by temporarily short-circuiting the diode 513 makes it possible to periodically reset this bottom measurement.
  • the subtraction stage comprises, in a known manner, an operational amplifier 533 receiving on the one hand the complete signal through the resistor 531 on its positive input and on the other hand the background at subtract through resistor 532 on its negative input.
  • the operational amplifier 553 comprising two diodes 551,552 in its feedback circuit.
  • the operational amplifier 593 of the summation stage 59 performs the addition of the background received directly from the first bottom measurement stage 51 through the resistor 591 and of the pulses received from the summation stage 57 through the resistor 592.
  • the rectifier circuit 50 is followed by a converter circuit 60 of pulses with an oblique flank into pulses with a steep flank, pulses more capable of being processed logically thereafter.
  • the pulses el and e2 generated by the photodiodes 32 or 33 have a first downward oblique slope corresponding to the progressive penetration of the mark in the reading field of the optical fibers, followed by a plateau during the passage of the body of the mark, and that ends a second rising oblique slope corresponding to the mark gradually leaving the reading field.
  • This converter 60 will now be described in relation to FIG. 3 from which one can distinguish four important stages: a first peak detection stage 61 followed by a subtraction stage 62 from the peak measured at the instantaneous signal followed by a comparison stage 63 of the difference with a predetermined threshold from a stage 64.
  • the result of the comparison is shaped by the operational amplifier 632, an inverted signal of which is generated by the inverter 633.
  • the output of the shaping amplifier 632 is also used in feedback to on the one hand reverse the direction of maximum detection of stage 61 and on the other hand modify the threshold value leaving stage 64.
  • the peak detection stage 61 essentially comprises a diode 614 (then 615) in relation to a capacitor 613, this device being isolated at the input by the conventional amplifier 611 and at the output by the operational amplifier 612.
  • the direction of detection maximum is initially determined by the state of the relay 65 selecting the diode 614 or 615.
  • This stage is reset, after a short delay introduced by the inverter 633 by means of the diodes 616 or 617 as the case may be, using relay 644.
  • the subtraction stage 62 receives on the one hand the signal coming from the peak detector stage 61 through the resistor 621 and on the other hand, through the resistor 622, the instantaneous signal previously amplified by a gain of 1 by the operational amplifier 619.
  • the comparison is carried out by the amplifier 631 receiving the threshold signal on its positive input and the difference signal on its negative input.
  • stage 61 first acquires the value of the base voltage, and the output of stage 62 first presents a zero signal which increases only at l appearance of the downward oblique slope of an impulse.
  • this oblique slope of this pulse has exceeded a predetermined threshold v1 with respect to the base voltage
  • the operational amplifier 631 switches over and there appears a first steep rise in voltage s11 at the output of the inverter 632.
  • This rise in voltage s11 first causes the selection of the diode 615 allowing the capacitor 613 to be discharged through the diode 617 then the connection of the diode 616, after a delay determined by the inverter 633.
  • the stage 61 is then ready to detect a new maximum but in the downward direction.
  • This first rise in voltage also caused in stage 64 a modification of the threshold voltage v2 by grounding the positive input gate of an operational amplifier.
  • Stage 61 then detects the value of the lower plateau of the input pulse el and the output of the subtraction stage 62 remains at zero during the entire duration of this lower plateau. Again, as soon as the beginning of the oblique flank of the ascent of the input pulse appears, the difference at the output of stage 62 increases until it exceeds the new threshold v2 of comparator 631 which is inverted thus causing a sudden descent of the shaping amplifier 612 s12.
  • the rising steep flank of the output pulse s1 corresponds substantially to the start of the descending oblique flank of the input pulse el
  • the steep flank falling from the output pulse s1 corresponds substantially to the start of the oblique flank rising from the input signal el.
  • the pulses s1 and s2 now in slots, originating respectively from the channel corresponding to the yellow color and from the channel corresponding to the blue color, are applied to a selection circuit 70 retaining the rising pulse s1 which will descend the first and which will correspond to the initial oblique and most contrasted impulse.
  • circuit 70 firstly comprises a first "OR” gate 71 receiving on each of its inputs one of the pulses in slots, and the output of which is connected to the clock input "CLK” of a first flip-flop 72.
  • the selection circuit 70 also includes as many secondary flip-flops 73,74 as pulses to be analyzed, these pulses being received in reverse manner respectively on their clock input "CLK”. All outputs reversed " Q ⁇ "of these secondary flip-flops are connected to the input of a second" AND “gate 75, the output of which is connected to the reset input” CL “of the first flip-flop 72.
  • This low state on the output” Q "of the flip-flop 72 also has the consequence of resetting all the secondary flip-flops 73,74 resetting all the outputs reversed " Q ⁇ "in the high state and thereby blocking these flip-flops rendering the rise of the next inverted signal inoperative.
  • The" AND “gate 75 returns to the high state which again releases flip-flop 72 ready for a next selection as long as an authorization on line 85 is maintained.
  • the device according to the invention further comprises an analog / digital and digital / analog converter 90 in relation to a microprocessor 80, this device being able to receive on line 81 a measurement of the value of the voltage of base in order to return on lines 82 an electrical signal corresponding to the gains to be applied to the automatic gain amplification circuits 40 and 41, and on the other hand on the lines 83 a threshold value for the comparator 63 of the circuits 60 and 61, threshold fixed between 100 and 400 millivolts above the noise of background measured on the basic signal.
  • the microprocessor also sends on line 85 a control signal blocking the selection circuit when no mark is expected.
  • this device inevitably detects a mark passing in front of the light flux coming from the source 20 by making an instant selection of the best reading channel, for yellow or for blue, taking into account the color, contrast and intensity of the brand sought.
  • the best reading channel for yellow or for blue

Landscapes

  • Spectrometry And Color Measurement (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Color, Gradation (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Credit Cards Or The Like (AREA)
EP92107486A 1991-05-06 1992-05-02 Vorrichtung zum Lesen von blassen Farbmarken in Druckmaschinen Expired - Lifetime EP0512448B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH132791A CH686357A5 (fr) 1991-05-06 1991-05-06 Dispositif de lecture d'une marque imprimée sur un élément en plaque ou en bande.
CH1327/91 1991-05-06

Publications (2)

Publication Number Publication Date
EP0512448A1 true EP0512448A1 (de) 1992-11-11
EP0512448B1 EP0512448B1 (de) 1997-04-09

Family

ID=4207872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92107486A Expired - Lifetime EP0512448B1 (de) 1991-05-06 1992-05-02 Vorrichtung zum Lesen von blassen Farbmarken in Druckmaschinen

Country Status (11)

Country Link
US (1) US5215011A (de)
EP (1) EP0512448B1 (de)
JP (2) JPH05147197A (de)
KR (1) KR970000777B1 (de)
AT (1) ATE151348T1 (de)
CA (1) CA2067994C (de)
CH (1) CH686357A5 (de)
DE (1) DE69218821T2 (de)
DK (1) DK0512448T3 (de)
ES (1) ES2100248T3 (de)
TW (1) TW276319B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1219420A1 (de) 2000-12-27 2002-07-03 Bobst S.A. Vorrichtung zur Abtastung von Registermarken in einer Mehrfarbendruckmaschine
DE102008049908A1 (de) * 2008-10-02 2010-04-08 Robert Bosch Gmbh Verfahren zur Erzeugung eines Detektionssignals und Erfassungseinrichtung

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Publication number Priority date Publication date Assignee Title
AU1205395A (en) * 1993-12-13 1995-07-03 Grant Maurice Bayley Machine readable code presentations
DE4401535C2 (de) * 1994-01-20 2002-10-24 Heidelberger Druckmasch Ag Verfahren zum Abtasten von im Mehrfarbendruck erzeugten Registermarken
CH690544A5 (fr) * 1995-05-08 2000-10-13 Bobst Sa Détecteur photoélectrique pour un dispositif de contrôle du registre dans une machine d'impression rotative.
EP0765748A3 (de) * 1995-09-29 1997-08-13 Goss Graphics Systems Inc Einrichtung zum Ausrichten von Bildern in einem Kontrollsystem für eine Druckmaschine
EP0770480B1 (de) * 1995-10-25 2001-12-19 Heidelberger Druckmaschinen Aktiengesellschaft Digitale Druckmaschine mit Registerregelung
FR2743079B1 (fr) 1995-12-27 1998-02-06 Inst Francais Du Petrole Procede et dispositif d'hydrogenation selective par distillation catalytique comportant une zone reactionnelle a co-courant ascendant liquide-gaz
FR2743080B1 (fr) 1995-12-27 1998-02-06 Inst Francais Du Petrole Procede de reduction selective de la teneur en benzene et en composes insatures legers d'une coupe d'hydrocarbures
GB9603582D0 (en) 1996-02-20 1996-04-17 Hewlett Packard Co Method of accessing service resource items that are for use in a telecommunications system
FR2743081B1 (fr) 1995-12-27 1998-01-30 Inst Francais Du Petrole Procede de reduction selective de la teneur en benzene et en composes insatures legers d'une coupe d'hydrocarbures
US6069890A (en) 1996-06-26 2000-05-30 Bell Atlantic Network Services, Inc. Internet telephone service
US6154445A (en) 1996-04-18 2000-11-28 Bell Atlantic Network Services, Inc. Telephony communication via varied redundant networks
US5828075A (en) * 1996-10-11 1998-10-27 Hurletron, Incorporated Apparatus for scanning colored registration marks
US6078582A (en) 1996-12-18 2000-06-20 Bell Atlantic Network Services, Inc. Internet long distance telephone service
US6137869A (en) 1997-09-16 2000-10-24 Bell Atlantic Network Services, Inc. Network session management
US6574216B1 (en) 1997-03-11 2003-06-03 Verizon Services Corp. Packet data network voice call quality monitoring
US6292479B1 (en) 1997-03-19 2001-09-18 Bell Atlantic Network Services, Inc. Transport of caller identification information through diverse communication networks
US6870827B1 (en) 1997-03-19 2005-03-22 Verizon Services Corp. Voice call alternative routing through PSTN and internet networks
US6591746B2 (en) 2001-06-13 2003-07-15 Hurletron, Incorporated Registration system for printing press
US7253929B2 (en) * 2002-02-06 2007-08-07 Quad/Tech, Inc. Camera assembly for a printing press
US7013803B2 (en) 2002-02-06 2006-03-21 Quad/Tech, Inc. Color registration control system for a printing press
US7074978B2 (en) * 2003-02-25 2006-07-11 Abb Lummus Global Inc. Process for the production of alkylbenzene
US8238538B2 (en) 2009-05-28 2012-08-07 Comcast Cable Communications, Llc Stateful home phone service
JP6292759B2 (ja) * 2013-03-12 2018-03-14 住友重機械工業株式会社 マークセンサ及び光検出素子によるマーク判定方法

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DE3311352C1 (de) * 1983-03-29 1984-03-15 Ingenieurbüro Rudolf Weber KG, 6100 Darmstadt Detektor zur Registrierung von Marken
EP0283899A2 (de) * 1987-03-25 1988-09-28 Kollmorgen Instruments Corporation Farbdichtemessverfahren bzw. System zur Identifizierung und Analyse gedruckter Vorlagen

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DE3311352C1 (de) * 1983-03-29 1984-03-15 Ingenieurbüro Rudolf Weber KG, 6100 Darmstadt Detektor zur Registrierung von Marken
EP0283899A2 (de) * 1987-03-25 1988-09-28 Kollmorgen Instruments Corporation Farbdichtemessverfahren bzw. System zur Identifizierung und Analyse gedruckter Vorlagen

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1219420A1 (de) 2000-12-27 2002-07-03 Bobst S.A. Vorrichtung zur Abtastung von Registermarken in einer Mehrfarbendruckmaschine
US7170648B2 (en) 2000-12-27 2007-01-30 Bobst, S.A. Device for scanning register marks into a polychrome printing machine
DE102008049908A1 (de) * 2008-10-02 2010-04-08 Robert Bosch Gmbh Verfahren zur Erzeugung eines Detektionssignals und Erfassungseinrichtung

Also Published As

Publication number Publication date
ATE151348T1 (de) 1997-04-15
JPH05147197A (ja) 1993-06-15
CH686357A5 (fr) 1996-03-15
CA2067994C (en) 1996-11-26
KR970000777B1 (ko) 1997-01-20
DE69218821T2 (de) 1997-10-16
KR920021317A (ko) 1992-12-18
CA2067994A1 (en) 1992-11-07
DK0512448T3 (da) 1997-10-27
DE69218821D1 (de) 1997-05-15
JP3041439U (ja) 1997-09-19
EP0512448B1 (de) 1997-04-09
US5215011A (en) 1993-06-01
ES2100248T3 (es) 1997-06-16
TW276319B (de) 1996-05-21

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